<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
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  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <input id="input" />
</body>
<script>
  function dosetTimeout() {
    // getMilliseconds 获取毫秒数
    console.log((new Date()).toLocaleTimeString(), (new Date()).getMilliseconds(), '假装发Ajax', input.value);
  }
  // 防抖 debounce 等电梯
  // 降频函数
  let timerId = null
</script>

</html>